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A tiny solid or liquid particle that is suspended in the atmosphere, generally one that initiates a phase change between the various forms of water. The very smallest and most numerous particles (known as Aitken nuclei), with radius <0.01–0.1 μm, do not act as condensation nuclei, which are found among the large (0.2–1 μm) and giant nuclei (>1 μm). See also freezing nucleus; ice nucleus; sublimation nucleus.

Subjects: Meteorology and Climatology.

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